nsresult
Monitor::Wait(PRIntervalTime interval)
{
AssertCurrentThreadIn();
// save monitor state and reset it to empty
PRInt32 savedEntryCount = mEntryCount;
CallStack savedAcquisitionContext = GetAcquisitionContext();
BlockingResourceBase* savedChainPrev = mChainPrev;
mEntryCount = 0;
SetAcquisitionContext(CallStack::kNone);
mChainPrev = 0;
// give up the monitor until we're back from Wait()
nsresult rv =
PR_Wait(mMonitor, interval) == PR_SUCCESS ?
NS_OK : NS_ERROR_FAILURE;
// restore saved state
mEntryCount = savedEntryCount;
SetAcquisitionContext(savedAcquisitionContext);
mChainPrev = savedChainPrev;
return rv;
}
nsresult
ReentrantMonitor::Wait(PRIntervalTime aInterval)
{
AssertCurrentThreadIn();
// save monitor state and reset it to empty
int32_t savedEntryCount = mEntryCount;
CallStack savedAcquisitionContext = GetAcquisitionContext();
BlockingResourceBase* savedChainPrev = mChainPrev;
mEntryCount = 0;
SetAcquisitionContext(CallStack::kNone);
mChainPrev = 0;
nsresult rv;
#ifdef MOZILLA_INTERNAL_API
{
GeckoProfilerSleepRAII profiler_sleep;
#endif //MOZILLA_INTERNAL_API
// give up the monitor until we're back from Wait()
rv = PR_Wait(mReentrantMonitor, aInterval) == PR_SUCCESS ? NS_OK :
NS_ERROR_FAILURE;
#ifdef MOZILLA_INTERNAL_API
}
#endif //MOZILLA_INTERNAL_API
// restore saved state
mEntryCount = savedEntryCount;
SetAcquisitionContext(savedAcquisitionContext);
mChainPrev = savedChainPrev;
return rv;
}
//
// Debug implementation of Monitor
void
Monitor::Enter()
{
BlockingResourceBase* chainFront = ResourceChainFront();
// the code below implements monitor reentrancy semantics
if (this == chainFront) {
// immediately re-entered the monitor: acceptable
PR_EnterMonitor(mMonitor);
++mEntryCount;
return;
}
CallStack callContext = CallStack();
// this is sort of a hack around not recording the thread that
// owns this monitor
if (chainFront) {
for (BlockingResourceBase* br = ResourceChainPrev(chainFront);
br;
br = ResourceChainPrev(br)) {
if (br == this) {
NS_WARNING(
"Re-entering Monitor after acquiring other resources.\n"
"At calling context\n");
GetAcquisitionContext().Print(stderr);
// show the caller why this is potentially bad
CheckAcquire(callContext);
PR_EnterMonitor(mMonitor);
++mEntryCount;
return;
}
}
}
CheckAcquire(callContext);
PR_EnterMonitor(mMonitor);
NS_ASSERTION(0 == mEntryCount, "Monitor isn't free!");
Acquire(callContext); // protected by mMonitor
mEntryCount = 1;
}
